Improvement in feeding mechanisms for sewing-fvsachines



2 Sheets$heet 1. M. CHRISTOPHERSON. FEEDING-MECHANISM FORSEWING-MACHINES.

No. 193,691. Patented July 31,1877.

ffiTERS. PHOTO-LITHQGMPHER, WASHINGTON. D C.

2Sheets-Sheet2.

M. CHRISTOPHERSON. FEEDING-MECHANISMFOR SEWING-MACHINES.

No. 193,691. Patented July 31,1877.

MFETERS. PHDTD-LITHDGHAFHER. WAbrIhNGTC/N b C UNITED MATHIASOHRISTOPHERSON, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN FEEDING MECHANISMS FOR SEWING-MACHINES.

December Specification forming part of Letters Patent No. 93,691, datedJuly 31,1877; application filed To all whom it may concern Be it knownthat I, MATHIAS CHRISTOPHER- SON, of Chicago, in the county of Cook andState of Illinois, have inventedcertain new and useful Improvements inSewing-Machines; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, which form a part of thisspecification.

This invention relates to the feeding mechanism of sewing-machines, andhas for its object to produce a feed-motion that may readily be changedfrom a four-motion, or up and-down and forward-and-backward motion, to asix-motion, adding two lateral or side motions by a simple and easyadjustment of certain parts, as hereinafter more fully described.

By my improvement 2. sewing-machine may be used with equal facility forordinary sewing, which requires only a four-motion feed,- and forornamental stitching, embroidery, or the working of button-holes, whichrequire a six-motion, while at the same time the length or throw of therespective motions may be easily regulated.

In the annexed drawing, Figure 1 is a plan of the under side of thebed-plate. Fig. 2 is a vertical section through the plane indicated byline 00 a; in Fig. 1. Fig. 3 is a plan view of the under side of theoscillating feed-bar. Fig. 4 is a perspective view of the reciprocatingfeed-bar and dog. Fig. 5'is a plan of the under side of the feed-plate.Fig. 6 is a side view of the feed-dog detached, and Fig. 7 is aperspective edge view of the feed-slideand front of oscillating bar.

Similar letters of reference indicate corresponding parts in all thefigures.

Ais the bed-plate, and B represents the crank operating-theshuttle-driving mechanism, which may be of any desired character orconstruction, and is not shown on the drawing. 0 is the feed'slide, towhich a reciprocating motion is imparted by a cam, c, keyed upon theshaft 7). D is a bar sliding in-a groovTe or depression in thebed-plate,

and having an arm D projecting at right angles, as shown. The bar D maybe moved forward or backward, and is kept permanent in any desiredposition by means of a setscrew, d, that projects up through a slot inthe bed-plate. Feed-slide 0 passes under the arm D of bar D, between twostuds, which form an adjustable fulcrum for slide 0, by

means of which a vibrating motion is imparted to the latter, the length,or throw of the vibrations being controlled and regulated'by theposition of bar D. The forward end of slide 0 has a beveled or inclinedshoulder, O, which works against a beveled strap, 01, rigidly securedupon a stud that projects down ward from the bed-plate by means of thescrew 6.

This arrangement-that is, the combination of the feeding-slide 0, havingthe beveled shoulder G, with the adjustable control-bar D and rigidbeveled strap d-will, when the slide 0 is operated by its cam, impart toit a combined vibrating and up-and-down motion. The forward end of slide0 rests in a notch in the feed-dog, (the detailed construction andoperation of which will be hereinafter described,) giving to the lattera forward-andbackward and up-and-down or four motion, such as isgenerally used when a sewing-ma chine is used for ordinary sewing, suchas stitching, hemming, &O.'

F is a gear-wheel, pivoted upon a short stud, f, that is affixed upon anoscillating plate, G. The latter is pivoted on a stud, g, and has aknob, g, by means of which it may readily be swung on its pivot g. h hare notches in the edge of the plate, and His a lock-lever, terminatingin the catch k, that interlocks with the notches h.

In the position of plate G shown in the drawing, gear-wheel F mesheswith wheel B 5 but when the plate G is swung in the direction, of thearrow, by unlocking the lever H and slipping its point or catch h intothe other notch, h, farthest from wheel B, the two wheels F and B willbe brought out of gear. ,Affixed upon wheel F is a cam, F, operating therod I, which carries a clutch, i, at its end, by means of which itengages with a bent arm, K of the plate K. The latter is pivoted at itupon the oscillating feed-bar L, but may be secured rigidly upon thelatter by means of the thumb-screw I, that passes. through a slot, l, inplate K. Mis a bar, pivoted at m upon a downward-projecting stud, andhaving a set-screw, m at one end, which projects up through a segmentalslot in the bed-plate A. At the other end there is a slot, m which formsa guide for a stud-screw, n, secured upon the rod I.

By this arrangement-that is, the combination of the rod I with theswinging bar M and bent arm K of plate K--the clutch *6 may be adjustedupon arm K in such a manner as to regulate the motions or vibrations ofplate K when this is not rigidly secured upon the feed-bar Lbythumb-screw l.

Feed-bar L is pivoted on a screw, 0, and has two ears, denoted by 1019,each of which has a segmental slot, 1) 19, within which are theset-screws q q. By tightening these two screws, feed-bar L will berigidly affixed upon the under side of the bed-plate; but when they areloosened, plate L may oscillate freely on its pivot-screw 0.

Thus it will be observed that when wheels B and F are geared thereciprocating rod I will impart an oscillating motion to plates K and L,provided that these two are rigidly secured together by the thumb-screwl,- but when the screw is loosened the plate K only I 3 L, having recess0* and slots 1) 11", incombination with the set screws q q andreciprocating will oscillate on itspivot 70, while plate L will remainstationary. The throw of plates K and L is regulated or controlled bythe control-bar M, in the manner already described.

The plate or feed-bar L has a raised step or shoulder, L, which isrecessed longitudinally and vertically, as represented by the letter T.Within this recess slides the feeddog N, the shape of which is shown inFig.

6. s is a pin or cross-pi'ece(see'F1'g. 3) inserted in the recess 1, soas to form a guide for the slotted shoe N of the feed-dog N, the forwardpart of whichv has a notch, t, for the insertion of the feeding-slide G,as already described. 0 is a pull-spring, one end of which is securedupon plate L, and the other end is inserted into a perforation, u, inthe forward part of the dog N, so as to pull this tightly against theunder side of slide 0, for the purpose of securing uniformity andevenness of the up-and-down motions.

The feed-plate B consists of two parts, viz., an upper and a lowerplate, the letter P, Fig. 5, representing the latter. slides in grooves(denoted bye '0) in the under side of the upper or main plate P, and hasa slot, 00, corresponding to the perforation y in plate P, so that thelateral motions of plate P, when the six-motion is in operation, shallnot interfere with the working of the needle and sewing mechanism. PlateP is moved by the. feed-stop N of dog. N pushscrew l tightened) areciprocating lateral motion is added to these, so that a six-motionedfeed is obtained.

The throw of the respective motions may be readily gaged by means of thecontrolbars D and M, in the manner that has already been described.

Having thus described my invention, I claim and desire to secure byLetters Patent of the- United States 1. The combination of shaft f,carrying the 1 wheel F and cam F", with the feed-rod I, pivotedcontrol-bar M, clutch t, and plate K, substantially as and for thepurpose herein shown and described.

2. The oscillating and adjustable feed-bar feed-dog N, substantially asand for the purpose herein shown and described.

3. The combination of shaft f, carrying the wheel F and cam F,feeding-rod 1, plate K,

bar L, and set-screws q q, substantially as and for the purposehereinbefore set forth.

4.. The oscillating feed-bar L, having re- Icess r, in combination withthe feed-dog N and the feed-plate P P, substantially as and for thepurpose herein shown and described.

5. In the feeding mechanism of a sewingmachine, the combination of thefollowing operating elements, to wit: the feed-slide 0', cam e,gear-wheel B, adjustable gear-wheel F, cam F, reciprocating rod I,pivoted plate 'K, control-bar M, oscillating feed-plate L, feeddog N,and feed-plate P P, all combined and arranged to operate substantiallyin the manner and for the purpose herein shown and specified. Plate P Intestimony that I claim the foregoing as my own I have hereto affixed mysignature in presence of two witnesses.

MATHIAS GHRISTOPHERSON.

Witnesses:

O. K. HONGER, HANS GABRIELSON.

